Tube-mill for cement, stones, and the like.



I. A. KNBCHT. TUBE MIEL FOR GEMERT, STONES, AND THE LIKE.

APPLICATION :FILED MARRE, 1908.

Patented July 6, 1 909.

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al'vfozneldo I. A; KNEGHT. l TUBE MILL FOB CEMENT, STONES', AND THE LIKE.

ArrLIoATIoN FILED lun. ze, 190s.

927,054.. Patented Juiy 6, 1909.

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. ya N H @A L-y I m i LI IRL guna/wko@ I. A. KNEGHT. TUBE MTLL FOR CEMENT, STONES, AND THE LIKE.

PPLIUATION FILED. HEAR. 26, 1908.

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Hoznmdo 1. A. KNEGHT. TUBE MILL POR CEMENT, STONES, AND THE LIKE.

rPLLGA'xL-ION FILED Mue, 190e.V n Patented July 6, 1909- 4 SHEETS-SHEET 4.

IRA A. KNECHT, NAZARETH, PENNSYLVANIAt TUBE-MILL FOB CEMENT, STONES,l AND THE LIKE.

vSpecification of Letters Patent. Application led Iarch 276, 1908. SerialIfo. 423,398.

' Patented"Ju1y"6,1909.

To all whom it may oncern:

Be it known that I, IRA A. KNEoHT, a citizen ofthe United States, residing at Nazareth, in the county of Northampton and State 5 of Fennsylvania, have invented certain new and useful Improvements in Tube-Mills for Cement, Stones, and the Like; and I do declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to tube mills for cement, graphite, blue-stone, rocks and the like, and to attachments 'for mills of this kind. f l

The object of this invention is to provide in a tube mill means for quickly and economically removing material which has been ground line enough from the material which has not been ground line enough.

Another object is to provide in a mill of this kind means for either raising or lowering the temperature ofthe material to be ground as desired. y

Another object is to provide =a. false head in the main cylinder of the to prevent the entrance of the grinding pebbles into the feed mechanism.

For these and still otherobjects which will appear as the nature of the invention is disclosed, my invention consists of certain novel arrangements and combinations of parts of Whichthe hereindescribed machine is one of many possible embodiments.

Inthe accompanying drawings, forming 'a part vof this specification, in which like reference characters refer to like parts throughout the several views and which are for illustrau tive -purposes only and therefore not drawn to any particular scale, Figure l is a longitudinal sectional view of a tube mill constructed with parts showing an embodiment of my invention; Fig. 2 isa top plan view of the same; Fig. 3 is an elevation showingthe forward face of the false head; Fig. -4 is a view of the rear face of the false head; Fig. 5 is a sectional view taken on the line 5-5 of Fig. 3; Fig.l 6 is -a view of the' forward face of the false head showin-g the air pipe attached; Figa? is a' `detailed sectional view taken on the line 7-7 of. Fig. 6'; Fig. 8 is a sectional view takenv on the lline 8#8 of Fig. 2; and Fig. 9 is aperspective view of a portion 0f the false head. l

5s Referring more pmicuiauy to the dmjw;

. illustrating ings cylinder 1 having trunnion bearings 2 and 3 supported on suitable foundations 4, having 'a feed mechanism generally indicated by*V reference numeral 5 and a discharge mechanism generally indicated by reference numeral 6. These parts may e of any .ordinary construction but for the purpose of the present invention, I have shown them as herein described.

The cyl'mder 1 is provided at its forward I show a tube mill comprising a maine.

or feed end witha forward head 7 secured as by bolts 8 to a flange 9 riveted or otherwise securedI to the forward end of the cylinderl the rear or discharge end ofthe cylinder is provided with a rear head 10 similarly secured to the lcylinder andprovided with 'a gear 11 adapted to intermesh with a similar gear 12 on the counter shaft 13 to lwhich power may be applied for rotating the machine.

The cylinder 1 is provided with a suitable side lining 14 and an end'lining 15 whereby the same is protected from the action of the grinding pebbles used therein. In the forward -or feed end of the cylinder I provide a false head 16 rigidly secured to the head 7 by means of bolts 17 andheld spaced from said head by means of bosses 18 as clearly shown.

Rigidly secured to said false head 16 are a lurality of buckets 19 substantially trianguar in cross section as shown in Fig'. 7 and having forward end120 open and rear end 21 closed. The 'outer or flat side 22 of the buckets 19 lie substantially flush with the lining of the cylinder, as herein shown. The cylinder lining is ma adjacent the buckets as at 23, 'but this construction is, of course, immaterial. The side of the bucket 19 which is formed by the false head 16 is provided with a pluralit of radially extending slots 24, said slots ing tapering as shown in Fig. 5; the forward or entrance opening rower than the discharge side 26 to prevent the ,material passing therethrough'froim being wedged therein. 4 is su ported upon a supporting hlock 27 secure in the foundation 4. rllhe feed mechanism 5 comprises a stationary supporting .portion 28 to which is securely` fastened in any convenient manner the feed tube 29. PassingY co-axial of the tube sition by 32rigidly rods in the alined bearings-31 f 25 of saidslots being nar- The feed mechanism 5 the .4

de Slightly thicker ico 29 is the feed shaft BOwhich is held in correct supported on the stationary part 28. The shaft 30 carries the feed screw 33 in the tube 29 and also carries between the bearings 31 and 32 a gear wheel 34 adapted to intermesh with the spur-gear 35 on the counter shaft 36; said counter shaft carries another spurvgear 37 which intermeshes with the larger gear 38 rigidly secured to the trunnion bearing tube. The counter shaft 36 may be divided and provided with any convenient form of clutch as 38. The outer end of the counter shaft 36 maybe provided with an eccentric pin 39 carrying a link 40 adapted to oscillatethe ar'm 41 whereby. the shaking hopper may be actuated.

` The forward face ofthe false vhead 16 is provided with an annular groove 43 placed concentric with said false head within the circle determined -by the buckets 19. The rearportion of said groove is cut-through to form slots 44 but lconnecting portions 45 are left to support the portion of said false head within. the circle determined by said groove. It will be noticed that when the radially extending slots 24 are at their highest point of movement, the uppermost slot 44 is a convenientdistance below said radially extending slots. Slidably received in the `upper part of said groove 43 is the arc-shaped pipe 46 rigidly and immovab discharge 4end 47 of the tube 29 by means of the braces 48 and the pipes 4 9. The pipes 49 communicate with the arc-shaped pipe 46 and-extend through longitudinal recesses 50' Near the in opposite sidesjof the tube 29.

entrance end'of said tube said pipes 49 v branch outwardly and then converge as at 51 and join in a single pipe 52 which is connected to -some source of supply of compressed air. This source of compressed air is not shown as it forms no part of the present invention and any form of air compressing means desired may beused.

The diagonally upwardly extendin A Por tion 53 of theplpe 49 together w1t the .braces 48form an efficient supporting means 46 is held firmly whereby the arc-shaped pipe in position in the annular groove 43 in such a Way that said arc-shaped pipe will not bear frictionally against the lsides of said annular groove. The pipe 46 is made tapering' in cross-sectionsto conform with the shape of the slot 43 and is provided with openings or ointing toward the dischar l e end of the cy inder and registering wit the slots44. A The rear end of the cylinder 1 is provided with a perforated diaphragm 55 which may be supported between the discharge passage block 56 and the clamping plate 57 and seclirely clamped together agalnst the cylinder ead bymeans of bolts58;^the discharge trunmon bearing 3 is provided with a cylindrical screen 59 adapted to permit the'material of. the `right fneness to pass down ly supported at the ground by th against each other and the lining of the cyl-A through the main discharge hopper 60 to pass along the coarse material and empty through the small discharge 61.

The cylinder 1 is provided with a man hole 62 by means of which access may be gained to the interior thereof for relining and repairs: the false head 16 is provided with a removable plate 63 by means of which access may be gained to the space between said plate and cylinder head 7. K The false head 16 acts to prevent any accidental entrance of the pebbles in the cylinder\1 into the feed tube 29, therefore it is possible to carry a larger quantity of pebbles in the drum in my machine than in other makes, the operation ofl the machine not being interfered with when the upper level of the pebbles is as highas indicated at 64 in Fig. 1.A

The operation of my device is as follows :f The rotation of the cylinder 1 causes the rotation of the feed screw 30 and the material to be ground is forced into the space between the head 16 and the head. 7 where it falls down upon the lining 22. The cylinder rotates in such a direction that the open end of the bucket 19 ieads'the closed end thereof and said bucket scoo s up a quantity of said material; as the buoi? of the cylinder its position becomes reverse and the slanting side of saidl bucket is`plac'ed to the lower side thereof, thus forcing the material in the bucket toward the slots 24 the material then falls downwardly among the pebbles in the cylinder. The material in thus falling must pass in front of the o ening 54 in the arc-shaped pipe and suita le air pressure being ap liedin said draft is createdA w ich drives ticles of the material which ma as fine as desired. The materia down among the peb e movement of the away the parbe already after falling lnder as the cylinder rotates. The rotation of the cylinder continually turning over the material therein causes different particles of material to be exposed to the air blast from the opening 54 and the air blast is of such an intensity that it blows on throughv the der any material that has been ground e enough.

' It is of course obvious that the air blast is pipe a strong blesis ground and re-- f pebbles stronger near the ripening 54 than it 'is of the cylinder. This causes particles of thematerial to be blown away from the forward end of the cylinder and deposited nearer the discharge end of he cylinder where they remain until the ave further advanced by ein air blast. In th teria iist leaves the material is deposited near thefdischarge en the gradually weakis. Way when the maslots 24 the coarsest nearer the feed end -of the c linder and the finest materialris deposite near the discharge end of the been ground fine enough to be sti] of this arrangement are obvious as the madevice may whereby the material entering the end of said cylinder is fed through said slots to the main body of the cylinder, means to feed the cylinder, the various grades ranging from` coarsest to finest are deposited along the cylinder from end to end. It will thus be seen that the material onentrance into the cylinder' is automatically deposited at the position where it must necessarily receive the required amount of grinding before it reaches the discharge end of the cylinder. The material which is sufficiently line onits entrance into the cylinder is iin-- mediately carried out of said cylinder without any further grinding. The advantages sition to be taken u by said buckets, and means whereby a lblast of air is forced through the material as it passes through said slots from said buckets.

2. In a tube mill, a rotating cylinder having a false head `near its forward end, said head having openings therein, a feed tube for said cylinder and means to conduct an air blast to and to discharge the same terial is never re-ground after it has been through certain of said openings and means ground fine yenough but is immediately reconnected to said false head to feed material moved from the machine and the material through the other of said openings.

3. In a tube mill, a false head having radial o eningstherein, buckets on the forward ace of lsaid false head, covering said radial openings, an annular groove having therein slots passing through said head, and means to pass an air blast through said last named slots and means to feed material to be ground to said buckets.

4. In combination, a rotating cylinder having trunnion bearings, trunnion bearings, means to rotate said cylinder, a stationary feed tube projecting into the forward end of one of said trunnion bearings,-a feed screw in said tube, meansbetween said feed screw and said cylinder whereby said cylinder causes said feed screw to rotate, a false head near the forward end of said cylinder radially extending slots near the periphery of said false head, triangular buckets having a single open end secured to said false head covering said radially eX- which requires least grinding stays in the cylinder the shortest length of time. This so increases the capacity of the grinding `mill that it has been found that a mill having a cylinder about 5 or 6 feet deep in diameter will grind as much as `six barrelsper hour more than a similar mill not fitted with the air blast attachment.

Another object of this machine is that by furnishing a hot .air blast high lime may be hydrated to its commercial condition, and low lime can be manipulated at all times by using cold air to give the greatest grinding capacity. By using cold air longer life is given to the pebbles because the pebbles are kept cool, and are thus prevented from seal ing and cracking.

The grinding capacity is increased by the continual separation of theA finished from the unfinished product, thus giving the mill the full work on the unfinished product at all times instead of on the finished and unfinished as heretofore. The addition of the false head gives a greater pebble capacity for the mill and at the same timein sures less repairs to the shaft, the feed tube and feed screws. It is of course obvious that the advantages of my device greatly decrease the number of horse power necessary to be used in operating the same. My be adapted to any of the ordrnary mills of this kind now on the market.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent, is:--

1. In a tube mill, a rotary cylinder, afalse head in one end of said cylinder, said head having formed therein feed slots arranged lin series at intervals around said head, a series of feed buckets arranged on said head opposite each of said series of 'feed slots with an annular groove between said buckets and the center of said false head, vsaid buckets beingV provided with a slanting side on the side nearer the center of said cross head, an arcshaped p' e having openings pointing toward the disc arge end of said cylinder, braces connecting said arc-shaped pipe with said feed tube, said feed tube being pro-` vided with longitudinal recesses, an air pipe assing through said recesses and connecting with said arc-shaped pipe and means .to hold said false head in sald cylinder.

In testimony w my hand in presence of two subscribingA wit- IIGSSGS.

IRA A. KNECHT. Witnesses: J. A. WIcKHUsER, WiLLIAM EoKERr material into said end of the cylinder in posupports for said tending slots, said false head being provided hereof I have hereunto set 

